It's a mistake to assume that the Appalachian community was most importantly Scots-Irish; the English component was just as significant, though it's rather unfashionable nowadays to acknowledge that. There was quite an important Scandinavian element, too, and it was from Northern Europe that the Appalachian dulcimer came to America. So far as Edward is concerned, Cecil Sharp found at least ten sets of it in Appalachia, but apparently only one example of Lizzie Wan.